WHAT DOES HODGDON US 869 POWDER CANADA MEAN?

A real magnum spherical rifle powder, it is superb with weighty bullets in massive, overbore rifle cartridges. US869 is usually a dense propellant that permits the shooter to work with plenty of powder to create maximum velocities in cartridges including the 7mm Remington Extremely Magnum, three hundred Remington Extremely Magnum, 30-378 Weatherby